Picture slide



Aug. 21, H923. l w. J. DONALDSON L PICTURE SLIDE Filedy May 5. 1922 m W fw M w f MM .V Zw. W, M.

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Patented Aug. 2l, H923.

UNHTEIDD STATES 'intatte WILLIAM J. DONALDSON, OF PHXLADELPHEA, PENNSYLVANM PICTURE SLDE.

Application led May 5, 192.2. Serial No; 558,718.

1 10 all whom it may concern Be it known that l, WiLLrAM J. DONALD- soN, a citizen of' the United States, residing at llhiladelphia, in the county of Philadel- 5 pliia and State of Pennsylvania, have invented a new and useful Improvement in licture Slides, owhich the following is a specification.

The invention relates to picture slides such as are used for exhibition in magic lanterns in connection with talking machines and such, for example, as are illustrated and described in my application for Letters Patent, Serial No. 458,825, although the invention is not confined to the slide iced mechanism there shown .or to any particular slide feed mechanism.

The succeeding pictures are on films and the films are in frames and the films tend to warp thus getting the pictures out of focus, and the films are exposed to accidental rupture. y

The principal object of the present invention is to prevent warping of the films or at any rate to confine such Warpin to* individual pictures and to confine the e ect of accidental rupture to individual pictures. To these and other ends hereinafter set forth the invention, generally stated, comprises a slide for picture exhibitors comprisp ing in combination front and back ladderlike plates having'their openings and bars in confronting relation, a picture film arranged between the plates with individual pictures opposite the openings, and the edges of the films and plates being crimped for co-operation With the bars to hold the films flat and localize injury to the pictures. The invention also comprisesthe improvements to be resently described and finally claimed, landpin the description reference will be made to the accompanying drawings forming part hereof and in which Figure l is a face View of one of the plates.

Fig. 2 is a like View of the other plate.

Fig. 3 is a like View of a slide embodying features of the invention, and

Fig. 4 is a transverse sectional view of Fic'. 3 drawn to an enlarged scale.

n the drawings l andv 2 are .ladder-like plates having openings 3 and bars e. The plate 2 for identification may be referred to as a front plate and the plate l as a back plate but oi course the nomenclature is immaterial. The openin 3 and the bars l are in confronting re ation and a picture film 5 is arranged between' the plates l and 2 with individual pictures 6 opposite the openings. rThe edges 7 of the film and 60 p ates are crimped.

By the descnbed construction the film is held fiat not only by the crimping but also by the bars Wh1ch overlie its suraceuand v'this warping of the film is opposed with 65 the result that the pictures remam 1n focus. If the film is ruptured, for example, by the finger of the operator or by some other accident, the rupture is confined to or localized at one picture by the bars or ladder-like C. construction. y

I cla-im: A slide for picture exhibitors com rising in combination ladder-like plates aving openings and bars in confronting relation, a picture film arranged between the plates with individual pictures opposite the openings, and the edges of the film and plates being crimped for co-operation with the bars in holding lthe film flat and in localizso ing injury to the ictures.

WILLI M J. DONALDSON. 

